8000 [3.13] gh-135171: Update documentation for the generator expression (GH-135351) by miss-islington · Pull Request #135525 · python/cpython · GitHub
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[3.13] gh-135171: Update documentation for the generator expression (GH-135351) #135525

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Jun 15, 2025
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[3.13] gh-135171: Update documentation for the generator expression (GH-135351) #135525

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gh-135171: Update documentation for the generator expression (GH-135351) 
* gh-135171: Update documentation for the generator expression

Document that the iterator for the leftmost "for" clause is created
immediately.

* Update Doc/reference/expressions.rst

Co-authored-by: Brian Skinn <brian.skinn@gmail.com>

---------
(cherry picked from commit 8979d3a)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Brian Skinn <brian.skinn@gmail.com>
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@serhiy-storchaka @bskinn @miss-islington
2 people authored and miss-islington committed Jun 15, 2025
commit 68340d994f2b0421527793f9ab80dc5943098cbd
5 changes: 3 additions & 2 deletions Doc/reference/expressions.rst
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Expand Up @@ -407,8 +407,9 @@ brackets or curly braces.
Variables used in the generator expression are evaluated lazily when the
:meth:`~generator.__next__` method is called for the generator object (in the same
fashion as normal generators). However, the iterable expression in the
leftmost :keyword:`!for` clause is immediately evaluated, so that an error
produced by it will be emitted at the point where the generator expression
leftmost :keyword:`!for` clause is immediately evaluated, and the
:term:`iterator` is immediately created for that iterable, so that an error
produced while creating the iterator will be emitted at the point where the generator expression
is defined, rather than at the point where the first value is retrieved.
Subsequent :keyword:`!for` clauses and any filter condition in the leftmost
:keyword:`!for` clause cannot be evaluated in the enclosing scope as they may
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Documentation/2025-06-10-17-02-06.gh-issue-135171.quHvts.rst
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@@ -0,0 +1,2 @@
Document that the :term:`iterator` for the leftmost :keyword:`!for` clause
in the generator expression is created immediately.
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